After the lemurs enjoy a night out in the park that had also given the penguins a better night's sleep, Skipper decides to help the lemurs continue to slip into the park via a secret tunnel, though the other penguins express concern. Julien is instructed to keep quiet about the arrangement, but soon spreads the word anyway, resulting in many of the zoo's animals venturing into the park at night. Skipper believes everything will be OK when the penguins discover this, only for Burt to complicate matters when he jackknifes himself inside the tunnel once morning comes, creating a traffic jam of sorts for the AWOL animals. While Kowalski tries in vain to free Burt, the other penguins attempt to delay Alice and the visiting Commissioner McSlade from discovering the absences. Ultimately, Julien unintentionally frees Burt when he opens a water main, believing it is a "smoothie pipeline," which blasts the animals back into their respective habitats.